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What are sync waves in ArgoCD? What is the default sync wave and how are negative waves used? Which resource types are commonly used as hooks? How do you annotate a resource with a sync wave? What are the hook deletion policy options? What resource kinds make good hooks and why Jobs specifically? What is the Sync phase (as opposed to PreSync/PostSync)? What are the hook phases and when does each run? How do sync waves and hooks interact? What are hook deletion policies?
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What are resource hooks in ArgoCD?

Beginner

Answer

Hooks are resources (usually Jobs or Pods) that run at specific points in a sync to perform tasks like migrations, tests, or notifications. They're marked with `argocd.argoproj.io/hook` and a phase (PreSync, Sync, PostSync, SyncFail, Skip). ArgoCD runs them at the right time and tracks their success as part of the sync.
metadata:
  annotations:
    argocd.argoproj.io/hook: PreSync
Real-world example A PreSync Job runs database migrations before the new application version is deployed.

Common follow-ups: What resource types are used as hooks? | What phases exist?

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